我试图在另一个if语句中使用变量集，但它一直返回未定义。这是PHP代码:if(isset($_POST['bookingTime'])){$bookingTime=$_POST['bookingTime'];$bookingDate=$_POST['theDate'];$dbDateTime=$bookingDate."".$bookingTime;echojson_encode($dbDateTime);exit;}if(isset($_POST['bookingPwd'])){$pwd=$_POST['txtBookingPwd'];//Getthe$dbDateTimevaria

我在我的mongoDB中有一个集合，它存储提供给客户的服务以及他们的电子邮件地址，如下所示{"_id":ObjectId("56a84627f8fd4a136c0e944a"),"Vehicle":"Honda","ServiceSelected":"FULLSERVICE","FullName":"xyz","Email":"xyz@xyz.com","BookingTime":ISODate("2015-12-27T06:00:00.000Z")},{"_id":ObjectId("56a84627f8fd4a136c0e944b"),"Vehicle":"AUDI","Servi